C++ Syntax

INPUT/OUTPUT PARAMETER

INPUT PARAMETERS

datatype Data type associated with count (handle).
count Number of elements to associate with status (integer).

OUTPUT PARAMETER

IERROR Fortran only: Error status (integer).

DESCRIPTION

MPI_Status_set_elements modifies the opaque part of status so that a
call to MPI_Get_elements will return count. MPI_Get_count will return a
compatible value.
A subsequent call to MPI_Get_count(status,datatype,count) or to
MPI_Get_elements(status,datatype,count) must use a data-type argument
that has the same type signature as the data-type argument that was
used in the call to MPI_Status_set_elements.

NOTES

Users are advised not to reuse the status fields for values other than
those for which they were intended. Doing so may lead to unexpected
results when using the status object. For example, calling MPI_Get_ele-
ments may cause an error if the value is out of range, or it may be
impossible to detect such an error. The extra_state argument provided
with a generalized request can be used to return information that does
not logically belong in status. Furthermore, modifying the values in a
status set internally by MPI, such as MPI_Recv, may lead to unpre-
dictable results and is strongly discouraged.
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does
not guarantee that an MPI program can continue past an error.